Wasn’t there a prison drama OZ? I think the term has come to symbolize any place where you feel out of you’re comfort zone. So it might be a straight medical drama about a resident, Dorothy, and they make jokes about the OZ but it is more symbolic than actual, but along the lines of what Obisgirl said. Scarecrow could be a psychiatrist, Tin Man the heart surgeon, and the lion an ER doc. But they would all be normal people and no magic.
“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass